Hmmm…  This looks like you will need:

1 Silent tuner board, 1 Order Switching board, 2 Buff N Blend, 3 Paramix ( you can use the outputs of these and/or switch/mix together for outputs).

GPCB doesn’t have a balanced output board.  I have a schematic for one if you want to build your own.  I can also build one on a VERO board if you wish.

You shouldn’t need any additional buffer boards for outputs as all of the above have buffered outputs built in.

Overall, I always believe in max versatility.  If you are going to the trouble to build this, you  may as well add all you can.

The Buff N Blend has one balance pot to adjust the mix of the wet and dry signals. If the wet signal from the effects loop is inverted, it may cause a phase cancellation with the dry signal.

The Paramix has separate wet and dry vol pots as well as a gain pot and a phase switch.  Therefore it has more versatility.

I suppose you may use all of one or the other if you do not anticipate any phase, gain or level issues.

@wilkie1, (out any one else who knows) after looking at how versatile the Paramix is, I have a couple of questions.

1. I’m interested in having three parallel loops all of which can be mixed back into the dry signal. Is three Paramix boards the best way to do this or is it possible with two Paramix and a Buff and Blend? Both space and signal quality are part of my decision process.
2. I’m a bit of a freak for expression pedal jacks. Control the rate and/or intensity on a Univibe with an expression pedal? Yes please. Octave Fuzz, delay, reverb, pitch shifters, EQ, literally anything, I can tweak wile I play.

So the thought is a single expression pedal in connected to a row of buffered expression out jacks, all TRS, which given I’m already struggling to fit everything into a Hammond 1590DD (7.4”x4.7”x1.3”) and seriously considering going to a 1550G(8.74”x5.75”x2.01”) just to preserve my sanity. The 1590DE(7.88”x4.73”x2.37”) may be a better option. I’ve also considered staying with the 1590DD and opening the front 3.68” of the top of the enclosure and braising a 1590BB on to of it,  giving a two level box with switches raised and pots on the lower deck.

The 1550G will ultimately be the lowest profile of everything but the 1590DD with no modification, but it’s a quarter inch wider than the space I have for this thing, which to be fair isn’t much.

Finally completely different direction, just find/fabricate a chassis that allows me plenty of room for all of this and more and just mount my pedal board on top of it

Did I mention I love the design phase?

i love your idea.  i sat on the paramix board for about a year until i finally decided on this monster.  if it doesn’t need to be a pedal, you can mash in a few more knobs and switches.  this was a 1590D enclosure, so almost too tall for a stomp box, but plenty of room to cram.  i have other ideas for a more compact paramix utility box and will probably take another stab at it.  inspired by your post  🙂

If I’m reading this right, the Buff&Blend can pass the full dry signal, whether the Paramix is engaged or not, so the three loops of the two Paramix boards chained together with the Send/Return connections of the first to the In/Out of the second creates the following:
1. Dry signal from the Buff & Blend
2. An II/IO channel that carries the Dry with whatever effect(s) it has.
3. The II/IO channel of the second Paramix which carries no dry signal
4. The Send/Return from the second Paramix which Carrie’s no dry signal.

I recognize this is a subject I am largely ignorant of, but am I close?

Still chewing on this one, and have some questions if anyone has answers. I really appreciate the time, b/c I suspect I need a lot more hand holding and clarification than your average forum member.
1. I look at this and wonder if I stick a Buff n Blend in front if that will keep the IO/II loop as 100% wet, or will it still have the dry signal even if I turn the blend all the way down on the BnB?

2. I would assume from the documentation the IO/II loop on the second Paramix would carry some signal from the first Paramix, but b/c it’s coming from the Send/Return loop on he first Paramix I think that means it’s 100% wet?
3. I’m assuming the Wet/Dry control allows true mixing of all three signal paths in parallel with this configuration. Right? or am I an idiot?

Now, this is the entirety of the Signal Chain for the build I’m planning. Assume I’m using breakout boards for switch wiring. I’m trying to put it all in a 1590DD or if I’m being dumb about space, a 1590D

Things that concern me.
1. 13 foot switches among various boards and loops

2. 16 pots among various boards

3. 18 TS/TRS jacks around the perimeter, potentially I could put a few on top, but have you seen the number of foot switches and pots I’m planning for? Might be more than this is I can figure out how to feed everything back into five jacks (Guitar In, FX Loop send, FX Loop Return, Amp Out, Mixer/Amp2 Out) something in me wants to be able to push stereo all the way through, but the only marginally more sane part of me says slow down, this is already going to be like eating an elephant

My current plan is to get a powder coated enclosure and use a laser cutter at my local maker space to link foot switches to pots with boxes and carve labels for everything with the laser. I’ve been experimenting and have the required settings and passes for powder coat cutting on lock down. I’ll post the enclosure for the Industrial Fuzz board I’m planning Wednesday or Thursday after I cut it.

I can also make labels with 0.06” thick anodized aluminum, etched by the same laser. I’ll try to make one or two of those at the same time.

what follows is a screen shot of the current signal chain I am contemplating. Comments and WTF are you thinking?! Are welcome and encouraged. Might have made a change or two while writing this huge wall of text that aren’t reflected in this list.